Sorrel \Sor"rel\, a. [F. saur, saure, OF. sor, sore, probably of Teutonic origin; cf. D. zoor dry, LG. soor; the meaning probably coming from the color of dry leaves. See Sear, a., and cf. Sorel.]

Of a yellowish or redish brown color; as, a sorrel horse.

Source: Webster's Revised Unabridged Dictionary (1913)
 

Sorrel \Sor"rel\, n. A yellowish or redish brown color.

Source: Webster's Revised Unabridged Dictionary (1913)
 

Sorrel \Sor"rel\, n. [F. surelle, fr. sur sour, fr. OHG. s?r sour. See Sour.]

(Bot.) One of various plants having a sour juice; especially, a plant of the genus Rumex, as Rumex Acetosa, Rumex Acetosella, etc.

Mountain sorrel. (Bot.) See under Mountain.

Red sorrel. (Bot.)
   (a) A malvaceous plant (Hibiscus Sabdariffa) whose acid calyxes and capsules are used in the West Indies for making tarts and acid drinks.
   (b) A troublesome weed (Rumex Acetosella), also called sheep sorrel.

Salt of sorrel (Chem.), binoxalate of potassa; -- so called because obtained from the juice of Rumex Acetosella, or Rumex Axetosa.

Sorrel tree (Bot.), a small ericaceous tree (Oxydendrum arboreum) whose leaves resemble those of the peach and have a sour taste. It is common along the Alleghanies. Called also sourwood.

Wood sorrel (Bot.), any plant of the genus Oxalis.

Source: Webster's Revised Unabridged Dictionary (1913)